2005 Honda Civic overheating?

  • Thread starter Thread starter bobweb
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bobweb

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The radiator cap should pull coolant from the reservoir overflow tank automatically as the engine cools down when the car's parked. If you have to top off the radiator itself continually, then you should replace the radiator cap with a new one specified for your car. It's normal for the temperature to rise enough to cause the radiator fan to come on and then cycle off when the temp gauge goes back down. Don't assume your temp gauge is accurate. A shop measures the temperature at the thermostat housing.
 
I have a 2005 Honda Civic automatic transmission with only 43,000 miles on it. Whenever I come off the highway the thermostat gauge needle starts rising almost to the H. I usually just turn the heater on high to bring it back to normal until I get to a parking lot and let it sit. I took it to Honda who did a pressure check and found no leaks. They did however, put in a new fan relay. When the problem was not solved, I had the radiator flushed and the lower hose and thermostat replaced by my mechanic. About a week later I took it on the highway again and the same thing happened.

When I get home, I usually wait for the engine to cool and check the coolant level in the radiator since the overflow tank is always full. Since I can usually see the tank holes in the radiator, I fill it up to the neck. I have checked my oil dipstick and cap, but everything looks fine. Also, locally the car doesn't overheat. And I've checked my fans which also come on. How can I check my water pump since there is no visual leak? Or should I just get it changed anyway? Any suggestions are helpful.
 
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